Had the same and I just wrote exactly what you’ve said in my loe to explain the overlap: that I had renewed before expiration. It isn’t necessary but sometimes the officers may need a lil info to better understand a situation quickly. Hope that helpsI have the same issue where passport 2 was issued before the expiry of Passport 2. I will use the dates as printed on the passports and provide an explanation in the explanation section.
I am not sure how to explain it though, any suggestions?